Pressure gauge



Patented Dec. 4, 1923.

71,476,1sa f PRESSURE Grauen.v

Application sled August 17,1921. serial No.. 492,918.

To all 'whom z5/may concern.' Y

vBe it known that l', WILBURN A. DE WOLEE, a citizen of theDominion of Canada, residing at Consort, in the county of Red Deer and Provinceof Alberta, have invented certain` new and use'ful Improvements in Pressure Gauges, of which the following is a specification. v. p

This invention relates to air pressure gauges commonly used to read the pressure when iniiating automobile tires.

The mainV object is to provide a means for setting the gauge at a certain pressure so that when the tire is inflated to that pressure the compressed air will be led through a by-pass and at the same time give a signal that the desired pressure has been reached. l

A. further object is tol-provide a gauge which can be set at a certain pressure' and the tire filled to that pressure without the necessity of attaching a separate pressure gauge to find the air pressure in the tire.

With these and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereunto appended.

Figure 1 is a sectional view of my invention, and

Figure 2 is a sectional view of the ressure gauge taken along line 2-2 of ure 1.

Referring to the drawings, like numerals designate like parts in the various drawinvs.

z3 indicates the body member which is preferably T-shaped having a hollow centre which forms three dierent air chambers 4, 5,*.and 6 in the respective Shanks 7, 8, and 9. The shank 7 is provided with an interiorly threadedscrew cap 10 for connecting onto the end of the tire valve. This cap is placed over the shank 7 and the end of the shank 7 is then flanged outwardly as at 11.

The shank 9 is provided with an exteriorly threaded kportion as at 12 over which fits a tubing (not shown) from a pressure tank or pump which tubing has suitable controlwhichy sleeve is screwed intov this portioniby anA ordinaryv screw driverlitting into "oppositely positioned slots ,60 in the outer end of sleeve 42. Theinn'er end of the-sleeve sionally held against the seat 14 of the sleeve means are properly lfitted intov the sleeve '42, the sleeve is then inserted and screwed into the end of shank 9. By having this The PATENT'fof-Fm forms aseat 14 for the valve'15 which is'ten'- valve 15 so positi'oned, the air is forced from thetubing into the air chamber 6 and Vinto the air chamber 4. lThe valve 15 isso positioned that it will not allow Ythe'air to pass from the `air chamber 4 back into the airy chamber 6.

`Referring to the shank 8, I provide ab flange 18 which ormsa valve seat for the valve 19, the valve stem 2O extending .upv tending neck portion 25 having interior threads 26 adapted to receive theexteriorly threaded portion 24 of the gauging -means 21.v The shank 8 and the cap 43 are provided with suitable registering slots 27 which in conjunction with the ared 'end 2 8 of the neck 25 causes a. whistle'when the air fills the air chamber 5. The lower end of the gauging means 21 is providedfwith a threaded collar 44 and a springf31 is' suitably positioned between the collar 44 and the valve 19. The graduation marks 23 are made to correspond with Vthe ico strength of the spring 31 so :that the spring resistance at each instance will beovercome when Athe pressure iin inch, as indicated ont e scale, has been reached on the lower face of the valve 19. By turning the gauging means 21 upwardly `in the neck 25 the tension of the spring 21 will become .less and will thus indicate ounds .per square on the gauge a lower pressure. Likewise it will take less pressure when the chamber "4 is filled to drive the valve 19 upwardly so as to allow the air to pass through the chamber 5 and escape into the slotsy 27 f` vided with a chamber in connection with a pressure source,-a removableV cap fitting ove'rone end of said body and adapted to closethe chamber outwardly, said capV having apertures leadingto the atmosphere from said chamber, an axial sleeve integral with said cap, an indioatorvmemberhaving threaded engagement with, said sleeve, a

"valve normally closing communication between said chamber and the pressure source, said valve having a stein inv sliding engagement with said member and a spring be- `said body integralftherewith and tween' said member and said valvertending to closethe latter. Y Y l. f ,Y

2'. yIn asafe'y valve haying 'abody vprovide with a chamber in connection witha pressure source, a removablel cap fitting over one end ofsaid body and adapted to vclose the chamber outwardly, said cap havrom said chamber, an axial sleeve integral withV said cap, an indicator member :i0Y ing apertures leading to they atmosphere V- having lthreaded engagement withV said sleeve,a valve normally closing''coi'nnm'inica-V tion between saideh'amber andthe'pres'sure source, said valve'havingv a stem in` sliding.

engagement with said member and a spring between said member'and said valve tending to close the latter, a transverse partition in with a seat for said valve;

ture.

f'wiLBnnN A.- nn woLFE. [nel provided In testimony whereof I aiiX my signaek Y 

